Keith Olbermann's improbable career swerves again when he debuts on NBC's NFL coverage Sunday. He will join its pregame show and says he'll present halftime "worst person in the NFL" segments spinoffs of his MSNBC Countdown show's "worst person in the world" segments.

Brigitte Nielsen has checked into rehab for treatment of an undisclosed condition, her manager confirmed Thursday. "All I know is it's something she did on her own free will and we're proud of her and wish her very well," her manager, Steven Tempone, told The Associated Press.

The prosecution's top forensic expert in the Phil Spector murder trial testified Monday she studied evidence in the case for more than a year but could not determine that the music producer fired the gun that killed actress Lana Clarkson. Defense attorney Linda Kenney-Baden asked sheriff's criminalist Lynne Herold: "In any of your reports, did you conclude with any degree of certainty that Phil Spector pulled the trigger on that Cobra (revolver) on Feb. 3, 2003?"

Sinad O'Connor is not your typical Christian music diva. The Irish singer/songwriter has torn up a picture of Pope John Paul II on Saturday Night Live, refused to have The Star-Spangled Banner played before a concert, been excommunicated after her "ordination" as a Catholic priest and announced that she was a lesbian before shortly recanting.

Tiger Woods has bounced a golf ball off his wedge - behind his back and through his legs - in a spontaneous ad for Nike. He played the role of Carl Spackler from "Caddyshack" in a commercial for American Express. And in his latest TV ad for Buick, Woods tackles a guy trying to make off with his golf clubs.

In the heart of San Diego's Titanium Valley, it's no surprise that you can sign up for what the TaylorMade Performance Lab bills as the "ultimate golf experience." For the last two years, avid golfers have been donning specialized motion capture suits to view their swings from every imaginable angle, and receive recommendations on the club fitting that will work for them.

Square drivers didn't go on sale to the public until last weekend, but Mark King, the CEO of TaylorMade Adidas Golf, was predicting the demise of the design well before Nike's Sumo Saturday. He is not alone in the belief that square drivers, as marketed by Nike and Callaway, will be fads.

The military is rushing armored vehicles with specially designed hulls to Iraq and Afghanistan to limit the damage from roadside bombs, the No. 1 killer of U.S. troops. The vehicles have a V-shaped hull, which disperses explosions and helps keep the vehicle from flipping.